Looper-thread-controlling mechanism for sewing machines



- Jul'y 12,v '1927.l

'J. R. MOFFATT LOOPER THREAD CONTROLLING MCHANISM FOR SEWING MACHINES Filed Aug. 'l 192:5

4 Sheet LOOPER THREAD QONTROLLING MECHMXISJI FOR SEWING MACHINES 'Ju'y E2, 3.927.

Filed Aug. V, 1923 4 Sheeifwmsheet 5 Julyv `1,2, v'1927.

-J. R. MoFFA'rT LOPER THREAD CONT-ROLLING MECHANISM FOR SEWING MACHINES Filed Aug. "7. 1923 4 Sheets-Sheet 4 Patented July'. 12,1927.

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COMPANY, or CHICAGO, ILLINOIS, A .CORPOBATION'OE InLfINoIsky LOOPEETIIREAD-CONTROLLING M ECHANIsM FORYSEWING MACHINES.

Application filed August 7, 1923. Serial No. 656,268.

The invention relates to new and Vuseful Vimprovements in looper thread VV'controlling mechanisms for sewing machines, and more particularly to a looper thread controlling 5. mechanism for asewing machine having a cylindrical WorkV supporting arm Within which the looper operating mechanismv is disposed. y

An object of the invention. is to provide l" a looper thread controller for a machine of the above type which includes means for pulling thread from `the supply for the looper, which thread pulling means is so constructed as to pull off varying amounts of D l'thread accordingto the length Aof the feed.

A further object of the invention is tov provide a mechanism .of thel above type wherein When the feed is adjusted for Evarying the length of the feed stroke,.the amount of thread pulled olf is automatically varied in proportion to thevariations in the; feed.

V A further object of the invention is to .pro-

. vide a thread controlling mechanism of the above type which also includes'A means` for 25 taking care of the slack during the "operations-of the looper. y f' A still further object of the invention is to provide a mechanism of the above type 'wherein the pull off. means andthelthrcad the loopen supporting shaft.

1 X-'still further object of the invention visto provide a thread controlling mechanism of the above type wherein the cooperating elecontrolling means arefboth operated from *37' ments of the pull off in addition to their movements relative to each other for pulling l as Viewed-from theotherside thereof;l

ofi' thread are moved'back and forth by the feeding mechanism in a. direction substan-` ,tially' at right angles to the thread pulling W movements' thereof, and wherein the cooperating thread pulling elements derive Vtheir movements from different parts of the feeding mechanism to that the variation in the thread pulled JOE. Y Y. A still further objectof the invention v`is to provide a slack thread controller forlthe.

"i" movement to lthe looper,'wherein said slack -thread controlling mechanism is-'operated by said looper shaft and moves bodilythere vwith during its endwise movements.: f

,the pull off camf cooperates;

`which carries the thread length ofthe feed Will vary'the amount ofv rguideswith Whichthe pull off camr cooper- T hese and other objects IWill ini'part` ,i obvious and Willin part be hereinafter more fully disclosed. y V

1 In thel drawings which ishovv ofv killustration one embodiment of=the."inven n throughftheeXtremerear endofthe feed bar, mi

partso f `the `machine;adjacent andthe thereto;` Y y Y VF ig; 5-is a perspective view of the bracket Aforfshifting the thread Aguides With WhichV Fig. 6 is a perspective view ofthe link` for A moving thev feed' bar endwise and showing the projecting arm which shifts .the'braclet 'Y carrying the thread guides cooperating withi` the pull olf cam; W i y Figf? perspectiveview of one member`` of the thread clampy l g Fig. 18 is a ,perspective'view of the sleeve lguides vcooperating With the take up cam; i

' 'Fig'. 9 is aside View of the thread lguides cooperating withv the pull off'rcam; Fig. l() is van end View of the same;` 'i Y F igzll is a side viewof said thread 'guides'V Fig. 12 is a side vievvof the thread guides for the take up cam; Fig 13, is a sectional view .on the line {"Fig. 14 is a plan-view of the same Ythread. guides; W t i v .Fig. 15 is a detail'in section Ashowingthe means forpreventing the sleeve carrying the j ates fronroscillating With the-.looper shaft,

- Fig. lois a `detail Ain section showing the l means Vfor 'preventing the guides cooperating avith the slack thread V control cam from, A v:oscillating Withthe looper shaft, and` Fig. 17 isa detail'showing theltakefup 195 andlooperthreadoperated upon thereby..." Y

y more particularly to a looper thread controlling mechanism for a cylindrical work supporting armv within `Vwhich the looper mechanism is packed. Said looper mechanism includes a shaft runninglengthwise of the arm on `which the looper or loopers, if more than one looper is used, are rigidly mounted. This shaft is oscillated and moved endwise so as to oscillate the loopers and give thereto a lateral movement.

. Thematerial is fed on to the arm during sewing by a feed dog carried by a feed 'bar which extends lengthwise of the arm. Said feed bar is raised and lowered by means of an eccentric on the looper supporting shaft Y' and it is moved endwise for the purpose of feeding the material by a rock frame operated fromthe cross shaft in the standard of the machine. This rock frame has a slotted extension to ,whichv the link is adjustably connected. yThis Vlink in turn is connected to the feed'bar and moves it endwise. Mounted on the looper supporting shaft is a bracket carrying a pull off cam which oscillates with the looper shaft and which moves' back and forthl with the feed bar. Cooperating with said pull off are thread guides through which the thread passes, and

these thread guides lay the threadin the lpath of the pull off cam. These thread guides are carried by a bracket which is "mounted on the looper supporting shaft so 4asto slide freely thereon. The link which moves the feed bar back and forth has a depending 'arm carrying the pivoted block :'which rides in a groove or recess Yin the bracket .carryingk thethread guides. This depending aim is oscillated toa" certain eX- ,tent by the means which moves the feed bar back and forthand the eXtent'iof its oscillation is determined rby the' length'of the stroke ofv the feed'bar, and variesaccording to the length of the reciprocations iii' the strokeofthe feed.l 1

VThe pull off cani also moves back and.

forth with the feed bar, but always has the saine relative movement imparted thereto as is given to the feed bar. The 'thread guides,

however, have a varying movement imparted thereto, depending upon the length of stroke ofthe feed bar. i VVben the length of the feed stroke is increased, then said thread guides are moved to a greater extent. Thus yit is that the amountof thread pulled offis Y determined 'by the length of'ffeed.V `There isa thread clamp between the pull off and I the loopers which clampsthe thread ywhilethe' same is being gpulled from the sup-y ply. There is also a take up camv operating upon the looper threadbetween the thread clamp. and the'loopers. The invention will possiblyl befbetter understood by a detail reference to the draw- The type of machine in which the in-rlshown and described in detail in the patent granted to Nl D. Clark, December 31, 1918, No. 11,289,663. Ttwill not be necessary to go into any great length of description of the general. parts of the machine. It is vthought' sufficient to point out that the inachine contains two needles 1, 1, carried by a needle bar 2 which is vibrated by the usual needle lever'. Cooperating with theneedles ybeneath the work support are loopers 2,2 which are mounted on a looper supporting shaft 3, which shaft is oscillated by suitable mechanism locatedin the standard 4 of thel machine. vThe mechanism within said standard is similar to that shown inPatent No. 583,414, granted Muther ct al., dated Y May 25, 1897, and has not been shown nor described in this application. The material is fed up the work support as it is stitched by means of a feed dog 5 which cooperates with .a pressure lfoot of the usual construction@ The feed dog 5 is carried by a feed bar 7.' This feed bar extends lengthwise vof the machine, and at its rear'end is forked as at 8 so astol engage a slabbed pin 9 carried byv a rock frame 10. y Said rock frame 10 is provided with a slotted bracket 11. A link 12 is pivoted to a bolt r13 adjustable in said slotted bracket. Said link at itsother end is pivoted at 14 to the feed bar. W hen l 4the rock f rame 10 is oscillated, itwill impart endwise movement to the link 12, and this in turn will move the feed bar back and forth, the forked end sliding on the,V

slabbed pin. Tn order to adjust the length ofthe stroke of thefeed, the link 12 is adjusted toward or away` from the center of the rock frame 10. This: is accomplished by loosening the bolt 13 in the slot of the rock` 1S which carries the threads dowii'into aY work supporting arm. Said threads Vafter ythey leave the tube V18 pass tothe threadv guide 19 and thence to the thread guide 20.

lThese thread guides 19 and 20 are formed' in a bracket 21. Said bracket 21 has a supporting shank 22 on which is mounted an This U-shaped part is formedwith an inclinedthreadslot 23 which ext-ends to thel thread guides 19 and 20. The threadguides 19 2md`20 are closed eyes except for the upwardly projecting U-,shaped part in which Y the thread guides 19 and 20 are formed.

lian' slot 23V leading 'thereinta- There isa projecting member 24 'carried by the U-shaped part in which the thread guides are formed which is adapted to receivethethreadand direct it intothe slot 23. There is a pro-y jecting member 25 Which is spaced sliggfhtlyV fromthe wall of the part having the thread guide 20 formed therein, and Which is bent so as to slightly overhang saidl Wall, Which operates to prevent the thread from diayving' back up into the slot 23 When the thread passes from the thread guide20 toward the forward end of the machine. This ,provides a Vpair of spacedthread guides which may be readily threaded. Cooperating Withsaid threadguides is a pull' off cam 26. Said pull off foam. 26V is rigidly secured to an out- Wardly projectingarm27 carried by a sleeve Y '28l (see 'Fig'. 3). This sleeve'28 ismounted .freely on the looper supportingshaft.y Said l sleeve. Vhoivever-,`is held fromrotation ony vsaid shaftl by means of'a "forked bracket 29' carried by a collar 30secured-to ,thelooper supporting' shaft by a set *screw 3l. The

sleeve 28 has a depending" lug.' 32 which 'extendsbetiveen the forked arin's` 29 vas clearly shown in Figures .4 and 5. 'y Thesev` forked arms do not prevent Ithe sleeve from movinzg` endivise on the looper supporting shaft.

shaft e 3.

Said sleeve 28 is located betweentheeonl 1 neeted collars 33 and 34 which are'likewsel freely mounted on the looper supporting The collar 33 has Va krecess 35 formed therein anda screw pin 36 .carried by the feed bar, passes down" into said recess 35.

The result is'that the connected collarsy 33 and 34 will be moved ybackV and forth with the feed bar and t-hesecollars will cause the sleeve 28 and the pull off cam Y carried thereby to move back and forth on' the looper supporting Shaft in unison .with the feed bar. This pull off cam 26 oscillates between the thread guides Y19 and 20' and will engage the looper threads running from one guide tothe other.

The supporting shankf22 on whichl the thread guides 19 and 2O are-mounted, is=in turn mounted in an arm 37 carried by a sleeve 38 mounted to slide freely onA the looper supporting shaft.: The link l2 which a moves the feed bar back and forthlhas a depending arm 39 on which is pivoted a block 40. The sleeve 38 is provided with a recess lin which the block 40 engages. t Will readily be seen tliat'when the link 1.2 is shifted forL varying the stroke of tlie feed bar, the arm 39 will be shifted, and thisin turn will shift the block 40 and move the 4sleeve 38 to an extent depending' uponthey extent to which the link is shifted. i

During the operation of the "machine, the

oscillations of the looper shaft impart anv oscillation to the thread cam 26. This is .brought about'by reason of the fact that While the sleeve 28 carrying theV cam 26 is sleeve has a lug32 extendingxbetween the Afreely mounted lonthe looper "shaft,` said Y forked armr y29 c'arriedfby the vcollar '30.

Which in turn is secured to the looper shaft (see Figjll). VVlgiil'e this cam 26' is oscillated With the looper shaft, it is free to move end'Wise-on the looper shaft for vreasons carrying the thread eyesv 19,. and 20 is mounted on v`the varm 37 formed Vasa part "of the sleev'e38. This sleeve38 is` freelyl mounted endwise thereof, but it isheldfrem oscillation With the looper shaftA by itssliding 'connection' with the guide '69.V From the vabovevitfwill be notedthatthe thread eyes are stationary andthe thread cam oscillates which Will bel stated later.V The member 22 Y' on the looper shaft so that itmay be moved lback and forthbetweenkr the thread: eyes, and

thus it is that the camcomes in Contact with the 1loo`per. thread passing "through, the

thread eyes, and, pulls thread `from the sup- .ply` at the 'proper tiine.z "The amount of thread pullelljiff is determined-bythe' sliapin@ of the cam' and thefposition ffscillation i of the' cam relative-to' the thread `'eyes'.` kThe "thread eyes andthe lcamfmo've iback'and forth Withtlie vfeed bar` but this moyementf n imparted tfthesefmemvbers of the pulloif mechanism.y does'not operate in any Way to V'pull thread;v `their relation to each other in "theifilateral mov'ementi's maintained always .thesame Neverthelesswhen the stroke of thefeed bar is adjusted, thenthe relative v -ioo oscillating positions of these parts is changed; Thethre'ad `eyes are connected as above noted to an-arm'ivhich is formed asa part-of the'linkwhichis shifted for varying Y the stroke of the feed,v andtherefore, when thislink is shifted, it will shift the positionv of the thread .eyesfllVhen you' shift eyes are moved closer'to'the 'path of oscillation of the pull off cam, 'andino-re thread 1s pulled off, and When the link isshifted to y).

shorten vthe feed, then theI thread eyes are moved away from the path of oscillation of the pull off cam, and less'thread is pulled off.

. iol

'the 'link to lengthen the feed,then the thread The looper'threadsafter leaving-the thread `guide 20, pass -to the thread clamp Which consists of a stationary member43 mounted on the Work sup'porting',arm4 by mea-ns of a shank 44and the clamp screw A45 which f passes through an opening in said shank and threads into the Work*supportingarm. vSaid 'secured'to the. shaft so a'stol move endvvise with the shaft, but thesleeve does'not oseillate' with the shaft.- Therev isa' collar 49 rigidly secured to the looper shaft atone d vend ofthe sleeve 48 and another collar 50 rigidly secured to the shaft at the other end ofi said sleeve. Formed on this sleeve 48 is y 48. The threadV after it leaves the thread clamp, `passes through ay thread guide 52 formed in a bracket 58. `Saidbracket 58 is provided with a shank 54, which extends -intoa slot 55 in the sleeve 48, and an overlying plate 56 secured to said sleeve by a screw 57 rigidly secures the shank to the sleeve. vSaid bracket 58 is provided with aninclined thread slot 58.v The brackct is bent into a U-shaped member, andi has the thread guide-59 directly opposed tothe guide 52. t The slot 58leads to both guides 52 and 59. The bracket 58 has a forwardly projecting finger 60 which directs the thread down into the slot 58. It also has amember 6l which isfprovided with a projectingend 62 which retains .thethread in the thread guide 59.` The thread after leaving the guide 59:

passes around the end 62 and in rearl of the f finger-@carried by the bracket 58. These fingers aid in the properly directing1 of the thread during the threading up of the. machineln The thread then passes yin rear of the thread guiding hook 64 and through an opening 65 in the bearing 66 for the looper shaft to the eyes ofthe thread carrying loopers. The bracket 58 moves back and forth with the thread carrying looper. l Cooperatingwith these thread guides`52 and 59 is a take-up Vcam 67, which take-up cam is`carried by the sleeve 49. The take-up cam` therefore, not only oscillates with the looper supportingshaft but moves endwise therewith. so that the slack thread controlling `mechanismA moves endwise with the looper supporting shaft, and therefore, said I thread take-up members will have no effect upon the thread passing to the loopers, except the action of the take-up cam on the thread as it vibrates back and forth and J comes into engagement with the thread passing between the thread guides.

The sleeve 88 which supports the guides cooperating with the pull off cam isheld from oscillating with the looper'fshaft by meansv of a projecting lug 68 on said sleeve, extending between guides 69. fixed to the work supporting arm.' The sleeve 48 is likewise held fromoscillating by means of a lug projecting therefrom and cooperating with guides 69 carried -by the work supporting arm.

. Operation.

It is thoughtithat the operation of my improved looper thread controlling mechanism will be obvious from the detailed description which has been given above. As the loopers move forward to enter the y,needle thread loops, gage the 'looper thread and take up the slack the slack thread controlling cams eny so as to prevent the thread from buckling in front of the looper. vWhen the looper starts on this retracting movement,the slack thread controlling cam will again take up Y the slack thread so as to insure that thev thread running from the eye of the looper to the previous stitch will be substantially .tautat the time. when the pointof the needle passes betweeny said looper threadand the body .of the looper which insures that the threadrtriangle shall ber spread and held so thaty the needle willv surely enter the same. V'Vhen the, loopers are being retracted, the thread clamp clamps the thread and the pull off operates to pull'off` thread for the next stitch. The pull off cam is oscillated the loopershaft and thel amount of thread pulled off is determined by the .position ofthe thread eyes and thepull off cam, which are in turn `determined by the movements ofy the lfeed bar on the one hand,vand theposition l of the linkwhich operates'the feed baron the other hand.l Thus it is that the amount of't-hread pulled off varies according to the length ofthe stitch.

vIn Fig. 17. of the in detail the takenp cam Afor kthe looper thread which is engagedA thereby. As the take-up cam movesdownwardly, the thread between the eyes of the thread guide 52 takes the lposition as shown in the dotted lines at a. `As soon `as the needles are completely through the triangle, the high point of the cam 67apasses the looper thread andl the thread slipsup along the portion 67@ into the cut-away portion of the cam at the upper portion thereof, and therefore, the thread drawings, l have shown parting'from the spirit of thevinvention as set forth in t-he appended claims. f

Having thus described theinvention, what I cla-im as new and desire tosecure by Letters-Patent, is

l. The combination with a'feeding mechanism including' a feeddog and means for l varying the stroke of the feed dog; of a pulloff mechanism including thread guides, a pull-olf member and means for giving said thread'guides and pull-o member a relative movement of aifixed extent for pulling thread fromthe supply, andmeans for automatically shiftingv the relative'path-of movement of the'guides and the pull-off member uponthe varying `of the; length of the feed. y

" ,is varied.

pull-off mechanism including movable'- 2. The combination with a feeding mechanism 'including a feed.V dog and means Vfor varyingthe stroke of thev feed dog; of 'a pulloff mechanism including. thread guides, 'a

pull-off member andineans for giving said thread guides and pull-off member arelative movement of a vhired extent for pulling Athread from the supply, means for moving.

saidthiead guides and pull-oil1 member back and forth with thefeed dog, said means including devices for automatically shifting the relative path of movement ofv the guides and pull-off member when the length of feed 3. The combination with a feeding mechamsm including a feed bar, a feed dog carried thereby, means for reciprocating the feed bar including 'devices whereby the` stroke of the feed dog may be varied; of a pull-off Acam member, thread guidesl cooperating with said thread cam member,` means for imparting a relative oscillating movement to said cam member, land. guides of 4a 'fixed extent for vpullingthread from the supply, and means fOrautOmatically shifting the relative path Vof'movement. of the guides and cam member upon thevaiying of lthe length of the feed whereby the amount ofthread pulledfoff y'autoin'ati'cally varies to accord with the lengthV ofV stitch.; Y

4. The combination with afeeding mechanism including a feed bar, a feed dog'carried thereby, means Vfor 'reciprocating thefeed blairV includingdevices whereby the ,stroke'of theV feed dog may be varied;V of apull-off mechanism including a movable pull off cam member.. movable back and'p'foith in unison with the feed bar', thread guides cooperating with said pull off member andvmovable-'ba'clc and forth Witlifthe feed bar, means` forv moving saidcam member relative tosaid guidesl for pulling thread from the supply, thread guides being connected to'tliedevicesV which vary the strokev of the feed dog so that the'amount of thread pulled oif" vis determined by thelength of lthe feed.

' 5. The combination with a feeding mechanism including ajfeed-bar, a feed dog carried I thereby, means for varying the stroke of "the feed dog, 4a -looper 'y mechanism including. a looper shaft, loopersrigidly carriedbyl said shaft, said looper shaft having.` an endivise andv anoscillating movement fof a p'ull olf mechanism including thread guides freely supported by Vsaid looper shaft,l a pull ofi' cam-freely supported 'said' looper shaft,

.means for causing said pull off cam to oscillate with the looperl shaft, means for inoying Y said oscillating camback and forthwith-the. feed bar,' and meansfor moving. said thread guides baci; and .forth VWith .and

Vshifting the .position of the thread `guides when the length ofV the feedwstroke is tvaried so that theatnount of thread-pulledy off is" i varied Withthe'length of thevfeed stroke.l

'6. A sewing machine including a lcylindrical Worksupporting arm, alooper shaft extending endwiseA thereof V and Hcarrying loopers, said shaft ybeing adapted` to oscillate Vand move lendWis'e, a 'feed bar extendingl lengthwise ofVV said 'arm and carrying a feed dog, ineansfor moving'said feedbar back v and forth '1 including devices whereby the stroke of the? feed bar' maybe varied,-apull off mechanism! including a pull off cam oscil- Se. v portingsaid pull olf cam on the looper shaft whereby the same can moveendivise `on the latin'g with the -looper`shaft, means for supshaft, means connected Witlithe feed bar for.. moving Vsaid pull off camin unisonwiththe fel'ed bar', thread guides with .which .said pull off cam cooperates, and means for mov.--

.ing said thread guidesy W-itli'the pull on? cam and for 'varying the positionfofithe'y thread L 'i guides accoi'dingto the lengthl of feed.

7.A' 'sewing machine Vincluding ar cylindricajlA WorksuppOrtingarm, a looper shaft extending V-endwise thereof' and carrying' 1 loopers, saidshaft being adaptedto oscil-A late and move endvvise, a feed'bar extending l 1lengthiviseofsaid arm andcar'ry'inga feed dog, meansyfor movingA said feed bar back v yand:forth including devices' Wherebyvthe stroke VVof the feedbar may bel varied, aV pullv off mechanism includinga pull o cam oseil-v 'lating iviththe loop'er shaft, meansjfor sup-.f

porting saidV pull off cam ori-the looper shaft Wherebythe same can move endyviseon the shaft, lmeans connected Vwith the .feed bar for moving said l pullgofl 'cam' infunison With the' feed bar, sleeve freely mounted on sa-id looper shaft, thread guidescarried by said sleevenith Whichsaid `pull offcamcooperates, -andmeans fori-,connecting .said

.sleeve ,with "the ,devices foropeiating the' Ho y i feed whereby-said threadA guides are moved baci; and forthwith the pull'off cani andthe j position thereof varied whensthe length of (feed is varied sothat theamount of thread pulled ofi ya'riens with the lengthgof '.feed.`

nection Withthe rockjframeland pivotedto' the feed-bar for moving said feed bar. back f i and forth, the Yadjustments of saidlinklva'ry- -ing thestijoke ofthe feed bar,` a'pnll `off v125 @mechanism including.thread guides, ".a'sl'eefve carryingsaidthreadj'guides, said llink yhaving a .frigid Projecting arm cnetel tojfsad- "si-ave; .whereby Said 'sleeve-'is mend Shack andforth the 'feedflbar fand is' shifted Vil.

when the stroke ofthe feed bar is varied,.and pull olf cam moving back f and forth through the:A feed bar andl moving between said thread. guides Vfor pulling off thread from' the supply.V

e 9. A sewingfmachine rincluding a cylindrical work supporting arm', a looper shaft extending lengthwise thereof and carrying loopers, said 'shaft being adapted to oscillate and-move endwise, a feedvbar extending d. tating on saidlooper supporting shaft.

lengthwise of'said arm and carryinga fee dog, a rock frame having a slotted bracket, a link having a shiftable connection with said slotted bracket at one end thereof and pivoted to the feed bar at the other end thereof,said link having a rigid arm projecting therefrom at an angle tothe longitudinal axis of the link, thread guides, a sleeve carrying lsaid thread guides, said lsleeve having a connection with said arm A whereby said sleeve mov'es back and forth with ythe feed bar and is shifted when the stroke Vof the feed Abar 'is varied, and a pull off cam moving Vback and forth with the feedbarand. moving between said thread guides rvfor pulling thread from the supply.

l0. A sewing -inachineincluding a cylin drical work supporting arm, a looper shaft extending,lengthwise thereof and carrying loopers, said shaft being adapted to oscillate andmove endwise, a feed bar extending lengthwise of said arm and carrying a feed dog, a vrock frame having a slotted bracket,

" a link having a vshiftable connection with.

said slotted bracket atvone end thereof and pivoted to the feed bar at thel other end thereof,I Said link having a rigid arm pro- )ecting therefrom atan angle tothe longitudinal axisrof thel link, 'thread guides,l a

sleeve carrying'v` said,V thread guides, said sleeve having a connection with said arm whereby said sleeve moves back 'and forth *.with the Yfeed bar and is shifted when the stroke of thefeedbar isfvaried, a pull off camkmoving back and forthwith the feed bar and movingbetween said thread guides for pulling'thread from` the. supply, said sleeve carrying theA thread guides being freelymounte'd oli-said Ylooper supporting shaft,'and means for preventing said sleeve u vfrom oscillating with the shaft.

l 111. A; sewing machine including a ,cylinf dricalwork ysupporting arm, a looper shaft extending lengthwise thereof andvrcarrying loopers, said shaft being adapted to oscillate and;V movek endwise, a feed bar'extending lengthwise of said arm and carrying affeed dog, a rock frame havingraslotted bracket,

linkv having a shiftable lconnection with saidj slottedbracketat one endthereof and pivoted to the feed bar at the other ,end

thereof', said `link having a rigid arm pro-v injecting therefrom at an ,angle tothe longitudinal axis of the link, thread guides/al lsleeve carrying said thread guides, said .shaftand` carrying said pull-ofi" cam, and

sleeve having a connection with said arm whereby said sleevemoves back and forth with the feed 'bar and is shifted when the stroke of the feed'bar is varied, a pull 0E cam moving back and forthwith the feed bar and moving between said thread guides for pulling thread from' the supply, a sleeve freely mounted on said looper supporting means whereby vsaid sleeve is held from 'rojebting therefrom, at an angle to the longi- Y tudinal axis of the link, thread guides, a sleeve carrying said thread guides, saidv sleeve, vhaving a connection with'said larm whereby said sleeve moves back and forth with the feed bar fand is shifted when the stroke of the feed bar is varied, a pull off cam moving back andv forth with the feed bar and moving between said thread guides for pulling thread from the supply, a sleev-e freely mounted on said looper supporting shaft and carrying said pull off cam,'means whereby said sleeve is held from rotating on said looper supporting shaft, Vand means connected tothe feed bar for moving the sleeve endwise of the looperl supporting shaft. n Y 18. A sewing machine including incombination a cylindrical work supporting arm, a llooper shaft extending longitudinally thereof, loopers carried thereby, said shaft being adapted to oscillateand move endwise, a slack thread vcontrolling mechanism in- -cluding an. oscillating cam fiXed'to the looper ysupporting shaftfthreadguides mounted on the looper supporting Lshaft and Vmovable endwise therewith, and means for preventing said thread guides from oscillating with the looper supporting shaft.

14. Asewing machine including in combination a cylindrical Work supporting farm, a looper shaft Vextending endwise thereof, loopers mounted on said shaft, said looper shaft being oscillated to move the loopers into and out of their needle thread loops and bejing moved endwise togive said. loopersl a needle avoidingmovement, a slack thread s controlling mechanism for the Vlooper threadv including a Vcam fixed to said loop'er supi porting shaft and moving therewith, thread Y guides with which said cam cooperates, a sleeve mounted on said shaft Vto move end-` vwise therewith and carrying saidk thread iesY guides, and means for preventing. said sleeve from oscillating with the shaft.

l5. A sewing machine including in combination a cylindrical work supporting arm,

a looper shaftk extending endwisek thereof, loopers vmounted on said shaft, said looper shaft being oscillated to move the loopeis into and out of their needle thread loops and being moved endwise to give said loopl ers a needle avoiding movement, a slackl thread controlling mechanism for the looper thread including a cam fixed to said looper supporting shaft and moving therewith,

thread guides with which said cam cooper,

ates, a sleeve mounted on Vsaid shaftrto move endwise therewith and carrying said thread guides, means for Vpreventing. said sleeve from oscillating with the shaft, a pulll off mechanism for the looper threads including a pull off cam, thread guides cooperating with said pull off cam, said pull olf cam' being operated by said looper shaft, and a thread clamp between the pull olf camand the slaclr thread controlling mechanism, andnieans operated by the endwise movement of the loope'r shaft for clamping the thread.` 16. A sewing machine including in com-v bination a cylindrical yworlt support-ing arm, arlooper Vshaftiezitending endwise thereof, loopers mounted on said shaft, said looper shaft beingv oscillated'to movethe loopers into and out yof their needle thread looops and being moved endwise to givesaid-loopclamp between the pull off cam and the Aslack thread controlling mechanism, andV means operated by the endwise movement of the looper supporting shaft for clamping the thread, said slack 'i mechanism, said pull off mechanism and said Y' thereof, a thread carryinglooper carriedV thread clamping mechanism all being.v lo-V cated within said cylindrical work support-V ing arm.

17. A sewing machine includingA in conibination, a cylindrical work supporting arm, a looper f shaft/ extending longitudinally thread controlling thereby, said shaft being adapted tooscil-Iv late and move en'dwise for vibrating and'y moving said looper laterally, and a slacky thread controlling mechanism including an oscillating member, and thread guides 'associated therewith locatedadja'cent the end offV the work supporting armnear the thread carrying looper, said slackthread controlling mechanism being movable with i the shaft in its endwise movement which gives the lateral movements to the looper whereby the lateral movements of the looper will not affect the control of the thread by said thread controllingmechanism.

18. The combination with a cylindrical work supporting arm, a thread carrying looper located at the free end of said arm, Vmeans for oscillating said thread carrying looper and for moving 'said thread carrying looper laterally, lslacli thread controlling Ymechanismv forthe looper located adjacent the end of the work supporting arm, and means for moving said slack thread controlling mechanism bodily wit'htheA looper on'v itsv lateral movements'. i n

19. A sewing machine including in combination, acylindrical work supporting arm,

a looper shaft extending longitudinally" thereof, a` thread carrying looperxcariied thereby, said shaft being adapted to'oscil-f `late and move endwise for oscillating the looper and moving the. same laterallyfa" slack thread controlling mechanism forthe looper thread located adjacent the looper and actuated by the'looper shaft, a pull-offv mechanism for the looper thread actuated` by the looper shaft, and a thread clamp'v disposed between lthe pull-,olf mechanism ,andk

the slack thread controlling mechanism operated: by said looper shaft. .A 20. AY sewing machine including'incombination, a cylindrical work supporting arm i a looper shaft extending longitudinally thereof, a' thread carrying Ylooper ,carriedV thereby, saidshaftv being Vadapted toffoscillate and move endwise for `oscillating thel looper and moving the same laterally, a`

slack thread controlling mechanism operated by the oscillations of said looper supportingjlfr. shaft, a pull-ofia mechanism'actiiated by the '0.' v'

oscillations lof said looper snpportingshaft,

and a thread clamp located between lsaid pull-off; mechanism and said k,sla-cl; thread controlling mechanism operated j by? the end-V. l

wise movement of said looper supporting shaft. I i y In `testimony whereof, I aiiix my'signaf- Jaiviiis n. Morriirr.

ture. 

